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| 型號： | 68HRC705J5A |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 91/106頁 |
| 文件大小： | 1069K |
| 代理商： | 68HRC705J5A |
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July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
REV 2.1
MOTOROLA
A-1
APPENDIX A
MC68HRC05J5A
This appendix describes the MC68HRC05J5A, a resistor-capacitor (RC) oscillator
mask option version of the MC68HC05J5A. The entire MC68HC05J5A data sheet
applies to the MC68HRC05J5A, with exceptions outlined in this appendix.
A.1
INTRODUCTION
The MC68HRC05J5A is a resistor-capacitor (RC) oscillator mask option version
of the MC68HC05J5A. The MC68HRC05J5A is functionally identical to the
MC68HC05J5A with the exception that the MC68HRC05J5A supports the RC
oscillator only, as outlined in
Appendix A.2
.
A.2
RC OSCILLATOR CONNECTIONS
This is the only oscillator option supported by the MC68HRC05J5A device.
On the MC68HRC05J5A device, an external resistor is connected between
OSC2/R pin and the V
SS
pin as shown in
Figure A-1
. The typical operating fre-
quency f
OSC
is set at 4MHz with the external R tied to V
SS
. Use the graph in
Figure A-2
to select the value of R for the required oscillator frequency.
The tolerance of this RC oscillator is guaranteed to be no greater than
±
15% at
the specified conditions of 0
°
C to 40
°
C and 5V
±
10% V
DD
providing that the toler-
ance of the external resistor R is at most
±
1% and the center frequency range is
from 3.8MHz to 4.2MHz. The center frequency is the nominal operating frequency
of the RC oscillator and can be adjusted by adjusting the external R value to
change the internal VCO charging current.
In order to obtain an oscillator clock with the best possible tolerance, the external
resistor connected to the OSC2/R pin should be grounded as close to the VSS pin
as possible and the other terminal of this external resistor should be connected as
close to the OSC2/R pin as possible.
Figure A-1. RC Oscillator Connections
MCU
OSC2/R
OSC1
R
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